In both TurboTax Online and TurboTax Desktop for a given tax year (TY 2025 currently):
The '2026 estimated tax' calculations live in the 2025 product and are based primarily on your 2025 tax, cr...
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In both TurboTax Online and TurboTax Desktop for a given tax year (TY 2025 currently):
The '2026 estimated tax' calculations live in the 2025 product and are based primarily on your 2025 tax, credits, and withholding.
When the interview asks for 2026 expected withholding, income, etc., those inputs are:
Used in certain what‑if (e.g., suggested quarterly payment amounts), But the core worksheet logic still typically anchors to 2025 tax liability and 2025 withholding as the baseline.
The estimated‑tax module is designed around the IRS safe‑harbor rules and typical workflows. Since it is a prediction and the 2025 tax year is the base for the basic workflow, it appears the 2026 information is not moving into the actual flow to the estimated tax forms. Although it does help you to know what amount you should consider in paying for estimated quarterly payments. In your situation, you are going in a reduced income situation which is not being accounted for.
For this reason you will need to make the adjustments on your actual payments using what you know will be the case for your situation. I will request a possible change, and then demand will likely dictate the results.